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* Param-example
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.param amplitude= 1V
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.subckt myfilter in out rval=100k cval=100nF
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Ra in p1 {2*rval}
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Rb p1 out {2*rval}
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C1 p1 0 {2*cval}
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Ca in p2 {cval}
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Cb p2 out {cval}
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R1 p2 0 {rval}
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.ends myfilter
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X1 input output myfilter rval=1k cval=1n
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V1 input 0 AC {amplitude}
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.end
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